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content/zh/docs/tasks/inject-data-application/environment-variable-expose-pod-information.md

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 title: 通过环境变量将Pod信息呈现给容器
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 此页面显示了Pod如何使用环境变量把自己的信息呈现给pod中运行的容器。环境变量可以呈现pod的字段和容器字段。
 
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 环境变量 和[DownwardAPIVolumeFiles](/docs/resources-reference/{{< param "version" >}}/#downwardapivolumefile-v1-core).
 这两种呈现Pod和Container字段的方式都称为*Downward API*。
 
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 {{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
 
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 ## Downward API
 
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 67108864
 ```
 
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 * [给容器定义环境变量](/docs/tasks/configure-pod-container/define-environment-variable-container/)
 * [PodSpec](/docs/resources-reference/{{< param "version" >}}/#podspec-v1-core)
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 * [ObjectFieldSelector](/docs/resources-reference/{{< param "version" >}}/#objectfieldselector-v1-core)
 * [ResourceFieldSelector](/docs/resources-reference/{{< param "version" >}}/#resourcefieldselector-v1-core)
 
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